PARTNERS CAPITAL OF AMERICAN ASSETS TRUST, L.P. (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Partnership Units
Capital Unit [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	232,099	173,594
American Assets Trust, L.P.
Capital Unit [Line Items]
Noncontrolling common units (in shares)	17,888,822
Percentage of ownership interests classified as noncontrolling	27.90%
American Assets Trust, L.P. | Operating Partnership Units
Capital Unit [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	232,099	173,594
American Assets Trust, L.P. | Common Shares
Capital Unit [Line Items]
Conversion of operating partnership units (in shares)	0
Limited Partner | American Assets Trust, L.P.
Capital Unit [Line Items]
Common unit conversion ratio	1